AGROTECHNOLOGY Late Blight Symptoms on Leaves

Late Blight Symptoms on Leaves

By
T.G. Lynn
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Initial symptoms on leaves are light to dark green
water soaked spots The spots are circular to
irregular in shape
Small lesion viewed from the upper side of leaflet
Small lesion viewed from the underside of leaflet
Large lesion viewed from the upper side of leaflet
Large lesion viewed from the underside of leaflet
A lesion that started in the middle of the leaflet
Late blight lesions are not limited by veins
A lesion with a yellowish halo When dry weather prevails lesions dry up and no fungal growth is present on the underside of leaves When wet weather returns the
fungus resumes growth again producing mycelium and spores
Dry lesion at the tip of a leaflet surrounded by a light green
halo Lesions often develop at the tips of leaflets where
dew is retained longest
Brown dry lesions
A lesion expanding on the leaflet The
white mycelium and spores of the
fungus develop at the edge of the
lesions usually on the underside of
leaflets Entire leaves can become
blighted as new infections occur and
existing lesions coalesce
T.G. Lynn
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